Malicious PDF — malware analysis report

Static analysis result for SHA-256 872ce413710779ed…

MALICIOUS

PDF

93.8 KB Created: 2021-08-16 22:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e19d38ceee5f4f73eb51062cba296b3 SHA-1: 562cfc568d736bfdf2fc8ed123d5a1a7661cbe36 SHA-256: 872ce413710779edfd26f5610ab88dd560c1f558e944b4b8f7db665331b8f767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=how+to+know+if+it+is+an+oxidation+reduction+reaction
    • https://detectiveoffice.net/userfiles/file/60796556126.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/nawaw.pdf
    • http://egyptlance.com/userfiles/file/rigakokolebunefibexu.pdf
    • https://oddluzanie.net/userfiles/file/14690521304.pdf
    • http://nhadephoanhao.vn/upload/ckupload/files/nomizor.pdf
    • https://genegurumiraclehealer.com/userfiles/file/67069164627.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/t3lhbon8glqo57ohff2p7shbk3/68699263516.pdf
    • http://geometracosentino.com/userfiles/files/xabuse.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8b606aed4a4feb7556fa4e2f917132d2/tufisifuda.pdf
    • https://hyosungulf.com/uploads/file/vijawotogumaja.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/db9cqh674c6lundbnskik7kme6/jilolokazorejanoworuni.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef7433a26---64871716260.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/22410167589.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f746bedaa2a6c739f13e902c41729bca/51461179926.pdf
    • https://erdenet.mn/userfiles/file/1962654552.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d755636b383c6ae31319ca0059a4efcd/24479065779.pdf
    • https://dienlanhbachkhoa.info/upload/files/30725676839.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/224b6e32340d7da65c3f55bd392768c5/10496504269.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/94c28c7f95ef85926ba82efeea96d994/gusetoniladil.pdf
    • https://twinslock.com/ckfinder/userfiles/files/29227162791.pdf
    • http://www.giuseppe.ru/ckfinder/userfiles/files/pimegipodoberum.pdf
    • https://alarouba.com/ckfinder/userfiles/files/lafodadulakox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d74.bin
f63fbc7ce22a31a4c249d6c77059b3ec95492eed3470a25b5ae5a3bf3f181f55
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 10796 bytes
font_01_sfnt_off00012689.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 16792 bytes
font_02_sfnt_off00013e9b.bin
546b0baba62e92348236af7e763e72849f08b96b4a1269c77dd80091fe8a2615
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9B 16468 bytes